diff --git a/cameraview/src/androidTest/java/com/otaliastudios/cameraview/engine/MockCameraEngine.java b/cameraview/src/androidTest/java/com/otaliastudios/cameraview/engine/MockCameraEngine.java
index d0c4e95b..63e553a1 100644
--- a/cameraview/src/androidTest/java/com/otaliastudios/cameraview/engine/MockCameraEngine.java
+++ b/cameraview/src/androidTest/java/com/otaliastudios/cameraview/engine/MockCameraEngine.java
@@ -119,10 +119,6 @@ public class MockCameraEngine extends CameraEngine {
         mExposureCorrectionChanged = true;
     }
 
-    @Override
-    public void setFacing(@NonNull Facing facing) {
-        mFacing = facing;
-    }
 
     @Override
     public void setFlash(@NonNull Flash flash) {
@@ -134,21 +130,11 @@ public class MockCameraEngine extends CameraEngine {
         mWhiteBalance = whiteBalance;
     }
 
-    @Override
-    public void setMode(@NonNull Mode mode) {
-        mMode = mode;
-    }
-
     @Override
     public void setHdr(@NonNull Hdr hdr) {
         mHdr = hdr;
     }
 
-    @Override
-    public void setAudio(@NonNull Audio audio) {
-        mAudio = audio;
-    }
-
     @Override
     public void setLocation(@Nullable Location location) {
         mLocation = location;
@@ -165,7 +151,8 @@ public class MockCameraEngine extends CameraEngine {
     }
 
     @Override
-    public void takeVideo(@NonNull VideoResult.Stub stub, @NonNull File file) {
+    protected void onTakeVideo(@NonNull VideoResult.Stub stub) {
+
     }
 
     @Override
@@ -197,4 +184,33 @@ public class MockCameraEngine extends CameraEngine {
     public void setPlaySounds(boolean playSounds) {
 
     }
+
+    @Override
+    public void setHasFrameProcessors(boolean hasFrameProcessors) {
+
+    }
+
+    @Override
+    protected boolean collectCameraInfo(@NonNull Facing facing) {
+        return true;
+    }
+
+    /*
+
+    @Override
+    public void setFacing(@NonNull Facing facing) {
+        mFacing = facing;
+    }
+
+    @Override
+    public void setMode(@NonNull Mode mode) {
+        mMode = mode;
+    }
+
+    @Override
+    public void setAudio(@NonNull Audio audio) {
+        mAudio = audio;
+    }
+
+    */
 }
diff --git a/cameraview/src/main/java/com/otaliastudios/cameraview/CameraView.java b/cameraview/src/main/java/com/otaliastudios/cameraview/CameraView.java
index e4a44ec6..b79059de 100644
--- a/cameraview/src/main/java/com/otaliastudios/cameraview/CameraView.java
+++ b/cameraview/src/main/java/com/otaliastudios/cameraview/CameraView.java
@@ -1301,6 +1301,9 @@ public class CameraView extends FrameLayout implements LifecycleObserver {
     public void addFrameProcessor(@Nullable FrameProcessor processor) {
         if (processor != null) {
             mFrameProcessors.add(processor);
+            if (mFrameProcessors.size() == 1) {
+                mCameraEngine.setHasFrameProcessors(true);
+            }
         }
     }
 
@@ -1313,6 +1316,9 @@ public class CameraView extends FrameLayout implements LifecycleObserver {
     public void removeFrameProcessor(@Nullable FrameProcessor processor) {
         if (processor != null) {
             mFrameProcessors.remove(processor);
+            if (mFrameProcessors.size() == 0) {
+                mCameraEngine.setHasFrameProcessors(false);
+            }
         }
     }
 
@@ -1322,7 +1328,11 @@ public class CameraView extends FrameLayout implements LifecycleObserver {
      * to preview frames.
      */
     public void clearFrameProcessors() {
+        boolean had = mFrameProcessors.size() > 0;
         mFrameProcessors.clear();
+        if (had) {
+            mCameraEngine.setHasFrameProcessors(false);
+        }
     }
 
 
diff --git a/cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera1Engine.java b/cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera1Engine.java
index 82259965..bbd799a1 100644
--- a/cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera1Engine.java
+++ b/cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera1Engine.java
@@ -279,6 +279,10 @@ public class Camera1Engine extends CameraEngine implements Camera.PreviewCallbac
         return false;
     }
 
+    @Override
+    public void setHasFrameProcessors(boolean hasFrameProcessors) {
+        mHasFrameProcessors = hasFrameProcessors;
+    }
 
     @Override
     public void onBufferAvailable(@NonNull byte[] buffer) {
diff --git a/cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera2Engine.java b/cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera2Engine.java
index 22df2dd8..57fed0a5 100644
--- a/cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera2Engine.java
+++ b/cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera2Engine.java
@@ -437,6 +437,11 @@ public class Camera2Engine extends CameraEngine {
         mPictureRecorder.take();
     }
 
+    @Override
+    public void takePicture(@NonNull PictureResult.Stub stub) {
+        // TODO
+    }
+
     //endregion
 
     //region Videos
@@ -726,32 +731,39 @@ public class Camera2Engine extends CameraEngine {
         mPlaySoundsOp.end(null);
     }
 
-    //endregion
-
-
-    @Override
-    public void onBufferAvailable(@NonNull byte[] buffer) {
-
-    }
-
     @Override
     public void setZoom(float zoom, @Nullable PointF[] points, boolean notify) {
-
+        // TODO
     }
 
     @Override
     public void setExposureCorrection(float EVvalue, @NonNull float[] bounds, @Nullable PointF[] points, boolean notify) {
-
+        // TODO
     }
 
+    //endregion
+
+    //region FrameProcessing
+
     @Override
-    public void takePicture(@NonNull PictureResult.Stub stub) {
+    public void onBufferAvailable(@NonNull byte[] buffer) {
+        // TODO
+    }
 
+    @Override
+    public void setHasFrameProcessors(boolean hasFrameProcessors) {
+        mHasFrameProcessors = hasFrameProcessors;
     }
 
+    //endregion
+
+    //region Auto focus
+
     @Override
     public void startAutoFocus(@Nullable Gesture gesture, @NonNull PointF point) {
-
+        // TODO
     }
+
+    //endregion
 }
 
diff --git a/cameraview/src/main/java/com/otaliastudios/cameraview/engine/CameraEngine.java b/cameraview/src/main/java/com/otaliastudios/cameraview/engine/CameraEngine.java
index 689dbd4d..d9723ed2 100644
--- a/cameraview/src/main/java/com/otaliastudios/cameraview/engine/CameraEngine.java
+++ b/cameraview/src/main/java/com/otaliastudios/cameraview/engine/CameraEngine.java
@@ -166,6 +166,7 @@ public abstract class CameraEngine implements
     protected float mZoomValue;
     protected float mExposureCorrectionValue;
     protected boolean mPlaySounds;
+    protected boolean mHasFrameProcessors;
 
     @Nullable private SizeSelector mPreviewStreamSizeSelector;
     private SizeSelector mPictureSizeSelector;
@@ -916,6 +917,8 @@ public abstract class CameraEngine implements
 
     public abstract void setPlaySounds(boolean playSounds);
 
+    public abstract void setHasFrameProcessors(boolean hasFrameProcessors);
+
     //endregion
 
     //region picture and video control
@@ -1160,12 +1163,16 @@ public abstract class CameraEngine implements
 
     public final long getAutoFocusResetDelay() { return mAutoFocusResetDelayMillis; }
 
-    final boolean shouldResetAutoFocus() {
-        return mAutoFocusResetDelayMillis > 0 && mAutoFocusResetDelayMillis != Long.MAX_VALUE;
+    public boolean getHasFrameProcessors() {
+        return mHasFrameProcessors;
     }
 
     //endregion
 
+    final boolean shouldResetAutoFocus() {
+        return mAutoFocusResetDelayMillis > 0 && mAutoFocusResetDelayMillis != Long.MAX_VALUE;
+    }
+
     //region Orientation utils
 
     private int computeSensorToViewOffset() {